A vacuum box sealing device for a papermaking vacuum roll

Abstract

The utility model discloses a kind of papermaking vacuum roll vacuum box sealing device, belong to papermaking vacuum roll field, the upper end of vacuum box is equipped with sealing cover, the lower end of barrel is equipped with movable support, limiting baffle compatible with sealing cover, limiting baffle limits movable support to drop, limiting baffle is fixed on vacuum box by fastening bolt;First sealing cavity, second sealing cavity are sequentially opened from top to bottom between movable support, sealing cover and limiting baffle, first sealing support is connected in the cavity of first sealing cavity, first sealing support and movable support are filled with first sealing filler. Movable support extrusion makes sealing support and sealing filler closely combine, improve sealing reliability. Two sealing supports are respectively arranged in two sealing cavities, and sealing filler is filled between movable support and sealing cover, double sealing is formed, to prevent vacuum box internal negative pressure leakage. Sealing cover and vacuum box integration, enhance sealing performance at the connection of barrel.

Description

Technical Field

[0001] This utility model relates to the field of papermaking vacuum rollers, and in particular to a sealing device for a vacuum box of a papermaking vacuum roller. Background Technology

[0002] In papermaking machinery, vacuum rolls and their associated vacuum chambers play a crucial role, especially the vacuum couch roll located at the end of the wet section of the paper machine. This component mainly consists of the roll body, vacuum chamber, operating and drive-side bearing housings, water spray pipes, air cushion pipes, rubber rollers, and vacuum regulating valves. The vacuum couch roll generates negative pressure through its built-in vacuum system, thereby drawing moisture from the wet paper web and accelerating the dewatering process. The vacuum chamber, as a key component of the paper machine's vacuum system, is typically located in the wet section, such as the wire section or press section. It applies negative pressure to the paper web to assist in its formation. In design, vacuum chambers usually employ a multi-chamber structure to allow for adjustment of vacuum levels in different areas according to the needs of the dewatering stage. During the papermaking process, the synergistic effect of the vacuum roll and vacuum chamber ensures uniform stress on the pulp during dewatering, resulting in high-quality paper. Furthermore, they effectively reduce energy consumption and improve production efficiency, making them indispensable core components of papermaking machinery.

[0003] In practical applications, the vacuum chamber and the cylinder are connected by an embedding method. The sealing strip between the embedding strip and the embedding groove is a key sealing element at the connection. It is susceptible to aging, hardening, or wear due to long-term exposure to temperature, humidity, and chemical substances. These factors lead to a decrease in the sealing performance of the sealing strip, making it unable to effectively prevent gas or liquid leakage. The aging and wear problems of the sealing strip are particularly significant under high temperature, high pressure, or corrosive environments.

[0004] The effectiveness of an embedded connection largely depends on the embedding depth and the precision of the fit. Insufficient embedding depth or poor fit will result in gaps at the connection, affecting the sealing performance. Furthermore, errors during manufacturing and installation can also lead to a loose fit between the embedding strip and the embedding groove, further reducing sealing performance.

[0005] Different working environments have different requirements for sealing strip materials. If the sealing strip material is incompatible with the temperature, humidity, and chemical substances of the working environment, it will lead to a decline in the performance of the sealing strip or even failure. For example, using a sealing strip that is not heat-resistant in a high-temperature environment may cause the sealing strip to soften, deform, or melt, thereby losing its sealing function. Utility Model Content

[0006] The main objective of this invention is to provide a sealing device for a vacuum box of a papermaking vacuum roller, which can effectively solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A vacuum box sealing device for a papermaking vacuum roll includes a cylinder, a vacuum box body, and a vacuum chamber, wherein the vacuum chamber is located inside the vacuum box body, and the vacuum box body is installed inside the cylinder body.

[0009] The upper end of the vacuum chamber is provided with a sealing cover, and the lower end of the cylinder is provided with a movable bracket and a limiting baffle that are adapted to the sealing cover. The limiting baffle restricts the movable bracket from falling and is fixed to the vacuum chamber by fastening bolts.

[0010] A first sealing cavity and a second sealing cavity are sequentially formed between the movable support, the sealing cover, and the limiting baffle from top to bottom. The first sealing cavity is connected to the first sealing support, and the space between the first sealing support and the movable support is filled with a first sealing filler. The second sealing cavity is connected to the second sealing support, and the space between the second sealing support and the sealing cover is filled with a second sealing filler. By the movable support pressing the sealing support and the sealing filler, the sealing operation at the connection between the cylinder and the vacuum chamber is achieved.

[0011] Optionally, the sealing cover is integrated with the vacuum chamber and is symmetrically distributed at the opening of the vacuum chamber. The cross-section of the sealing cover is L-shaped, and a sealing rubber strip is provided at the connection between the sealing cover and the cylinder.

[0012] Optionally, the cross-section of the movable support is designed in an inverted "F" shape, the movable support is integrated with the cylinder, the side strip of the movable support is embedded in the inner end of the sealing cover, and a sealing rubber strip is provided at the connection between the side strip of the movable support and the sealing cover.

[0013] Optionally, the limiting baffle and the movable bracket are welded and fixed to the cylinder, and the connection between the limiting baffle, the movable bracket and the cylinder is an elastic part. The connection between the limiting baffle and the vacuum chamber is provided with a sealing rubber strip. The screw holes of the limiting baffle and the vacuum chamber are aligned, and the limiting baffle is fixed to the vacuum chamber by fastening bolts.

[0014] Optionally, the cross-sections of the first sealing bracket and the second sealing bracket are designed in the shape of an "I". The first sealing bracket and the second sealing bracket are made of rubber brackets, and a sealing rubber strip is provided between the first sealing bracket and the second sealing bracket and the movable bracket and the sealing cover.

[0015] Optionally, the first and second sealing fillers are any one or a combination of flexible graphite fillers and braided fillers, polytetrafluoroethylene fillers, rubber and synthetic resin fillers, and fiber braided fillers.

[0016] Optionally, the side insert of the movable bracket moves up and down in the opening of the sealing cover, and the movable bracket and the sealing cover squeeze the sealing bracket and the sealing filler.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The compression action of the movable bracket ensures a tight bond between the sealing bracket and the sealing filler, significantly improving the reliability of the seal. A first sealing bracket and a second sealing bracket are respectively installed in the first and second sealing cavities. Sealing filler is used between these brackets, the movable bracket, and the sealing cover, forming a double seal that effectively prevents leakage of negative pressure inside the vacuum chamber.

[0019] The integrated design of the sealing cover and the vacuum chamber, along with the "L"-shaped cross-section of the sealing cover, enhances the sealing performance at the connection between the sealing cover and the cylinder. Furthermore, sealing rubber strips are installed at the connections between the sealing cover and the cylinder, the side strips of the movable support and the sealing cover, and the limit baffle and the vacuum chamber. These sealing rubber strips further improve the sealing effect, ensuring the stability and safety of the equipment during operation.

[0020] The sealing device features a rational structural design and simple assembly process. The side insert of the movable bracket can move up and down within the sealing cover's opening. This movable design not only facilitates assembly and adjustment but also helps maintain the sealing effect during the operation of the papermaking vacuum roller. Meanwhile, the limiting baffle is fixedly connected to the cylinder and movable bracket by welding, ensuring the device's stability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of part of the vacuum box and cylinder structure of this utility model;

[0022] Figure 2 This is a side view of part of the vacuum box and cylindrical structure of this utility model;

[0023] Figure 3 This is an exploded view of the sealing cover, movable bracket, sealing bracket, and limiting baffle of this utility model;

[0024] Figure 4 for Figure 2 Enlarged diagram of point A in the middle.

[0025] In the diagram: 1. Cylinder; 2. Vacuum chamber; 3. Vacuum chamber cavity; 4. Sealing cover; 5. Movable bracket; 6. First sealing cavity; 8. First sealing bracket; 9. First sealing filler; 10. Second sealing bracket; 11. Second sealing cavity; 12. Second sealing filler; 13. Limiting baffle; 14. Fastening bolt. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0027] like Figure 1 - Figure 4 As shown, a vacuum box sealing device for a papermaking vacuum roller is disclosed. The device mainly consists of a cylinder 1, a vacuum box 2, and a vacuum chamber 3. The vacuum chamber 3 is located inside the vacuum box 2, which is installed inside the cylinder 1. To ensure a good seal, a sealing cover 4 is specially designed at the upper end of the vacuum box 2, while the lower end of the cylinder 1 is equipped with a movable support 5 adapted to the sealing cover 4 and a limiting baffle 13. The limiting baffle 13 restricts the movable support 5 from falling and is fixed to the vacuum box 2 by fastening bolts 14 to ensure the stability and safety of the device.

[0028] A first sealing cavity 6 and a second sealing cavity 11 are sequentially formed from top to bottom between the movable support 5, the sealing cover 4, and the limiting baffle 13. A first sealing support 8 is connected inside the first sealing cavity 6, and a first sealing filler 9 is filled between the first sealing support 8 and the movable support 5. Similarly, a second sealing support 10 is connected inside the second sealing cavity 11, and a second sealing filler 12 is filled between the second sealing support 10 and the sealing cover 4. Through the squeezing action of the movable support 5, the sealing support and the sealing filler are tightly bonded, thereby achieving a sealing operation at the connection between the cylinder 1 and the vacuum chamber 2.

[0029] The sealing cover 4 and the vacuum chamber 2 are integrated into one unit, with the sealing cover 4 symmetrically distributed at the opening of the vacuum chamber 2. To improve the sealing effect, the sealing cover 4 has an "L"-shaped cross-section. Furthermore, a sealing rubber strip is provided at the connection between the sealing cover 4 and the cylinder 1 to enhance sealing performance. The movable support 5 has an inverted "F"-shaped cross-section and is integrated with the cylinder 1. The side insert of the movable support 5 is embedded in the inner end slot of the sealing cover 4, and a sealing rubber strip is also provided at the connection between the side insert of the movable support 5 and the sealing cover 4 to ensure a good seal.

[0030] The limiting baffle 13 and the movable bracket 5 are connected to the cylinder 1 by welding. The connection between the limiting baffle 13, the movable bracket 5 and the cylinder 1 is an elastic part, and a sealing rubber strip is provided at the connection between the limiting baffle 13 and the vacuum chamber 2. To ensure a stable connection between the limiting baffle 13 and the vacuum chamber 2, the screw holes of the limiting baffle 13 and the vacuum chamber 2 are aligned, and the limiting baffle 13 is fixed to the vacuum chamber 2 by fastening bolts 14.

[0031] The first sealing bracket 8 and the second sealing bracket 10 have an "I"-shaped cross-section and are made of rubber. To further improve the sealing effect, a sealing rubber strip is provided between the first sealing bracket 8, the second sealing bracket 10, the movable bracket 5, and the sealing cover 4. The first sealing filler 9 and the second sealing filler 12 can be any one or a combination of flexible graphite filler and braided filler, polytetrafluoroethylene filler, rubber and synthetic resin filler, and fiber braided filler to meet the sealing requirements under different working conditions.

[0032] The side strip of the movable bracket 5 can move up and down within the slot of the sealing cover 4. The movable bracket 5 and the sealing cover 4 achieve a sealing effect by compressing the sealing bracket and the sealing filler. This design not only improves the reliability of the seal but also ensures the stability and safety of the equipment during operation.

[0033] The vacuum chamber 2 is installed inside the cylinder 1, ensuring that the vacuum chamber cavity 3 is located inside the vacuum chamber 2. Next, the sealing cover 4 is integrated with the vacuum chamber 2, with the sealing covers 4 symmetrically distributed at the opening of the vacuum chamber 2. Then, the movable bracket 5 is integrated with the cylinder 1. The movable bracket 5 has an inverted "F" shaped cross-section, ensuring that the side inserts of the movable bracket 5 can be embedded in the inner end slot of the sealing cover 4. Next, the limiting baffle 13 is welded to the cylinder 1 and the movable bracket 5. The limiting baffle 13 prevents the movable bracket 5 from falling. At this point, the connection between the limiting baffle 13, the movable bracket 5, and the cylinder 1 forms an elastic part. Then, the first sealing bracket 8 and the second sealing bracket 10 are installed into the first sealing cavity 6 and the second sealing cavity 11, respectively, ensuring that there is space between the sealing brackets, the movable bracket 5, and the sealing cover 4 to fill with sealing filler. The space between the first sealing bracket 8 and the movable bracket 5 is filled with the first sealing filler 9, and the space between the second sealing bracket 10 and the sealing cover 4 is filled with the second sealing filler 12. Finally, align the screw holes of the limiting baffle 13 with the screw holes of the vacuum chamber 2, and fix the limiting baffle 13 to the vacuum chamber 2 with the fastening bolts 14 to complete the assembly.

[0034] During operation, the papermaking vacuum roll begins to run, generating negative pressure in the vacuum chamber 2, which adsorbs the pulp onto the roll surface to form paper. To ensure a tight seal between the vacuum chamber 2 and the cylinder 1, the movable support 5 is subjected to a certain amount of pressure during the operation of the papermaking vacuum roll, causing the side strip of the movable support 5 to move up and down within the opening of the sealing cover 4. This movement compresses the first sealing support 8 and the second sealing support 10, as well as the first sealing filler 9 and the second sealing filler 12, ensuring a tight seal. Sealing rubber strips are provided at the connection between the sealing cover 4 and the cylinder 1, the connection between the side strip of the movable support 5 and the sealing cover 4, and the connection between the limiting baffle 13 and the vacuum chamber 2 to enhance sealing performance. Furthermore, the limiting baffle 13 is fixed to the vacuum chamber 2 by fastening bolts 14 to ensure the stability and safety of the device. Through reasonable sealing and structural design, the entire device improves the sealing effect of the papermaking vacuum roll, ensuring the stability and safety of the papermaking process.

[0035] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A papermaking vacuum roll vacuum box sealing device, comprising a cylinder (1), a vacuum box body (2) and a vacuum box cavity (3), the vacuum box cavity (3) is located in the inside of the vacuum box body (2), the vacuum box body (2) is installed in the inside of the cylinder (1), characterized in that: The upper end of the vacuum chamber (2) is provided with a sealing cover (4), and the lower end of the cylinder (1) is provided with a movable bracket (5) adapted to the sealing cover (4) and a limiting baffle (13). The limiting baffle (13) restricts the movable bracket (5) from falling. The limiting baffle (13) is fixed to the vacuum chamber (2) by fastening bolts (14). The movable support (5), the sealing cover (4) and the limiting baffle (13) are sequentially provided with a first sealing cavity (6) and a second sealing cavity (11) from top to bottom. The first sealing cavity (6) is connected to a first sealing support (8), and the first sealing support (8) and the movable support (5) are filled with a first sealing filler (9). The second sealing cavity (11) is connected to a second sealing support (10), and the second sealing support (10) and the sealing cover (4) are filled with a second sealing filler (12). The movable support (5) squeezes the sealing support and the sealing filler to achieve the sealing operation at the connection between the cylinder (1) and the vacuum box (2).

2. A vacuum box sealing device for a papermaking vacuum roll according to claim 1, characterized in that: The sealing cover (4) is integrated with the vacuum chamber (2). The sealing cover (4) is symmetrically distributed at the opening of the vacuum chamber (2). The cross-section of the sealing cover (4) is "L" shaped. A sealing rubber strip is provided at the connection between the sealing cover (4) and the cylinder (1).

3. A vacuum box sealing device for a papermaking vacuum roll according to claim 2, characterized in that: The cross-section of the movable bracket (5) is an inverted "F" shape. The movable bracket (5) is integrated with the cylinder (1). The side strip of the movable bracket (5) is embedded in the inner end of the sealing cover (4), and a sealing rubber strip is provided at the connection between the side strip of the movable bracket (5) and the sealing cover (4).

4. A vacuum box sealing device for a papermaking vacuum roll according to claim 3, characterized in that: The limiting baffle (13) and the movable bracket (5) are welded and fixed to the cylinder (1), and the connection between the limiting baffle (13), the movable bracket (5) and the cylinder (1) is an elastic part. The connection between the limiting baffle (13) and the vacuum chamber (2) is provided with a sealing rubber strip. The screw holes of the limiting baffle (13) and the vacuum chamber (2) are aligned, and the limiting baffle (13) is fixed to the vacuum chamber (2) by fastening bolts (14).

5. A vacuum box sealing device for a papermaking vacuum roll according to claim 4, characterized in that: The first sealing bracket (8) and the second sealing bracket (10) have an "I" shaped cross-section. The first sealing bracket (8) and the second sealing bracket (10) are made of rubber brackets. A sealing rubber strip is provided between the first sealing bracket (8) and the second sealing bracket (10), the movable bracket (5), and the sealing cover (4).

6. A vacuum box sealing device for a papermaking vacuum roll according to claim 5, characterized in that: The first sealing filler (9) and the second sealing filler (12) are any one or a combination of flexible graphite filler and braided filler, polytetrafluoroethylene filler, rubber and synthetic resin filler, and fiber braided filler.

7. A vacuum box sealing device for a papermaking vacuum roll according to claim 6, characterized in that: The side strip of the movable bracket (5) moves up and down in the opening of the sealing cover (4), and the movable bracket (5) and the sealing cover (4) squeeze the sealing bracket and the sealing filler.

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